func_uri.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Created by Olle E. Johansson, Edvina.net
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */
 
/*! \file
 *
 * \brief URI encoding / decoding
 *
 * \author Olle E. Johansson <oej@edvina.net>
 *
 * \note For now this code only supports 8 bit characters, not unicode,
         which we ultimately will need to support.
 *
 * \ingroup functions
 */
 
/*** MODULEINFO
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/app.h"
 
/*** DOCUMENTATION
    <function name="URIENCODE" language="en_US">
        <synopsis>
            Encodes a string to URI-safe encoding according to RFC 2396.
        </synopsis>
        <syntax>
            <parameter name="data" required="true">
                <para>Input string to be encoded.</para>
            </parameter>
        </syntax>
        <description>
            <para>Returns the encoded string defined in <replaceable>data</replaceable>.</para>
        </description>
    </function>
    <function name="URIDECODE" language="en_US">
        <synopsis>
            Decodes a URI-encoded string according to RFC 2396.
        </synopsis>
        <syntax>
            <parameter name="data" required="true">
                <para>Input string to be decoded.</para>
            </parameter>
        </syntax>
        <description>
            <para>Returns the decoded URI-encoded <replaceable>data</replaceable> string.</para>
        </description>
    </function>
 ***/
 
/*! \brief uriencode: Encode URL according to RFC 2396 */
static int uriencode(struct ast_channel *chan, const char *cmd, char *data,
             char *buf, size_t len)
{
    if (ast_strlen_zero(data)) {
        buf[0] = '\0';
        return 0;
    }
 
    ast_uri_encode(data, buf, len, ast_uri_http);
 
    return 0;
}
 
/*!\brief uridecode: Decode URI according to RFC 2396 */
static int uridecode(struct ast_channel *chan, const char *cmd, char *data,
             char *buf, size_t len)
{
    if (ast_strlen_zero(data)) {
        buf[0] = '\0';
        return 0;
    }
 
    ast_copy_string(buf, data, len);
    ast_uri_decode(buf, ast_uri_http);
 
    return 0;
}
 
static struct ast_custom_function urldecode_function = {
    .name = "URIDECODE",
    .read = uridecode,
};
 
static struct ast_custom_function urlencode_function = {
    .name = "URIENCODE",
    .read = uriencode,
};
 
static int unload_module(void)
{
    return ast_custom_function_unregister(&urldecode_function)
        || ast_custom_function_unregister(&urlencode_function);
}
 
static int load_module(void)
{
    return ast_custom_function_register(&urldecode_function)
        || ast_custom_function_register(&urlencode_function);
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "URI encode/decode dialplan functions");